Dallas County Water Quality
Dallas County, Iowa
Water Grade
A
Water Score
86.0
Violations
0
State Rank
#16
of 99 (1 = best)
EPA SDWIS Compliance
Drinking Water Quality
Water Quality Grade
A
Based on EPA compliance history and violation data
Water Score
86/100
Higher = better quality
Health Violations
0
Health-based violations
Violation Rate
0.0%
Systems with violations
Water Advisory: Dallas County
Water Verdict
Dallas County receives an excellent water quality assessment with a grade of A and a score of 86.0 out of 100. The water supply meets or exceeds federal safety standards, and residents can generally drink tap water with confidence.
Violation Context
Dallas County has recorded zero health-based violations, indicating that the water system has met all federal safety standards during the reporting period. The violation rate is zero per 1,000 residents, which is the best possible outcome.
Consumer Guidance
Tap water in Dallas County is generally safe to drink based on available data. Residents should still review their utility's annual Consumer Confidence Report for transparency on detected contaminants. For long-term peace of mind, request your utility's latest Consumer Confidence Report and consider independent water testing if you have specific health concerns.
Regional Context
Dallas County has better water quality than the average county in Iowa. Its water score is 14.3 points higher than the state average, indicating stronger water system performance relative to neighboring counties.
Past 5 years
Water Quality Monitoring
Monitoring Sites
16
Active in the past 5 years
Measurements Recorded
4.3K
4,348 total readings
Most Measured
- Physical
- Nutrient
- Inorganics, Major, Non-metals
Categories measured most frequently
Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).
Live USGS Streamgage
River & Stream Conditions
Current Discharge
1,380cfs
May 14, 6:00 PM UTC
vs Long-Term Average
81%
Below typicalPrimary Streamgage
Raccoon River at Van Meter, IA
- USGS site
- 05484500
- Drainage area
- 3,441 sq mi
- Long-term mean
- 1,702 cfs
One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges — this view summarizes the primary one. The long-term mean is the full-record annual average; "% of typical" compares the latest reading against that average.
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Frequently Asked Questions
What is the water quality in Dallas County, Iowa?
Are there any water violations in Dallas County?
How much water-quality monitoring happens in Dallas County?
What's happening with rivers in Dallas County right now?
How does Dallas County water compare to the Iowa average?
Is tap water safe to drink in Dallas County?
Does Dallas County have clean drinking water?
How does Dallas County rank for water quality in Iowa?
Counties with Similar Water Quality
Data Sources
Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Water-quality monitoring counts from the EPA Water Quality Portal (WQP) — federated USGS, EPA, and state agency sampling records over a rolling 5-year window.
Live streamflow from the USGS National Water Information System (NWIS) — continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.